I cloned my repository locally from 192.168.1.25. I then tried to open the repository to extract the code. All I got was this error. I had already upgraded to version 767ae79c3d and rebuilt the repository on server prior to cloning. I opened the tcl-dev repository file and examined the blob and filename tables and determined there were quite a few files with size -1 and Null contents.There are also many entries where the contents are empty and the size is not -1. The file below (aes.tcl) has a size of 84 and the contents are null. I changed the size to -1 and retried opening the local repository again and it failed with same error.  Perhaps a force option is needed to keep extracting the data when and error is hit.

 $fossil open ../../tcl-dev 
 Autosync:  http://192.168.1.25:8081/
                Bytes      Cards  Artifacts     Deltas
 Send:            5911        124          0          0
 Received:          46          2          0          0
 (null): content missing for lib/tcl/tcllib-1.11/aes/aes.tcl